JPH0261717A - Disk device - Google Patents

Abstract

PURPOSE:To increase data access speed by providing a memory like a random access memory on the outside of a disk device and providing the directory part of the disk device on this memory. CONSTITUTION:The disk device consists of a device main body 1, a data access device 2, a directory part 3, a data part 4, and a random access memory 5. When the power source of the device main body 1 is turned on, contents of the directory part 3 are copied on the random access memory 5. At the time of accessing data, the data access device 2 makes access to the memory 5 and contents of the directory part 3 are made access, and data storage information to the data part 4 is read and written. Data in the data part 4 is made access based on this directory information. Thus, contents of the memory 5 are copied in the directory part 3 before the power source of the main body 1 is turned off, and they are held even when they are changed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk device, and particularly to an improvement in a data access method.

[Conventional technology]

FIG. 2 is a block diagram showing a conventional disk device.
In the figure, 1 is a disk device, 2 is a data access device, 3 is a directory section, and 4 is a data section.

Next, the data access method will be explained.

The data access device 2 accesses the directory section 3 and reads data storage information in the data section 4 stored in the directory section 3. Next, the data in the data section is accessed.

[Problem to be solved by the invention]

In this case, since the directory section 3 exists in the disk device 1, there is a problem in that the data access device 2 has to drive the slow disk device 1 every time it accesses a directory.

This invention was made to solve the above-mentioned problems, and an object thereof is to provide a disk device that can access directories at high speed.

[Means to solve the problem]

The disk device according to the present invention has a separate memory such as a random access memory, and stores the contents of the directory section in this memory when the disk is in operation.

[Effect]

In the disk device according to the present invention, the directory held on the disk is stored in a memory such as a random access memory when the disk is operated.
By accessing the directory on the memory, the directory can be accessed at high speed.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a disk device according to an embodiment of the present invention,
In the figure, 1 is a disk device main body, 2 is a data access device, 3 is a directory section, 4 is a data section, and 5 is a random access memory.

Next, the operation will be explained.

When the power of the disk device main body 1 is turned on, the contents of the directory section 3 are copied to the random access memory 5. To access data, the data access device 2 accesses the random access memory 5 and accesses the contents of the directory section 3 in the random access memory 5, that is, reads or writes data storage information to the data section 4. 0 Then, data in the data section 4 is accessed based on the directory information.

By copying the contents of the random access memory 5 to the directory section 3 before turning off the power of the disk device main body 1, the contents are retained even if the contents of the directory change.

In the above embodiment, a case has been explained in which the contents of the random access memory are erased when ta is turned off. However, if the contents of the random access memory are not erased even when the power is turned off, the directory section in the disk device It is also possible to eliminate this and always hold the directory part on random access memory.

Furthermore, although the case of random access memory has been described above, it is also possible to use high-speed memory other than random access memory.

〔Effect of the invention〕

As described above, according to the present invention, a memory such as a random access memory is provided outside the disk device, and the directory section of the disk device is held on the memory, so that the directory section can be accessed at high speed. This has the effect of improving data access speed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a disk device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional disk device. In the figure, 1 is a disk device main body, 2 is a data access device, 3 is a directory section, 4 is a data section, and 5 is a random access memory. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A disk device main body including a directory section and a data section, and a memory provided separately from the disk device main body, and when the disk is operated, the contents of the directory section held on the disk are stored. A disk device characterized by storing data in the memory described above.